This paper presents a comparison of four types of
on-board batteries charging systems for Electric Vehicles (EVs)
and Plug-in Hybrid Electric Vehicles (PHEVs), and their impact
on the power quality of the electrical power grid. In the
comparison are analyzed the features, the characteristics and the
operation of each charging system, aiming their controllability
and their impact on the electrical grid, mainly considering the
Total Harmonic Distortion (THD) of the consumed current and
the power factor. Besides the normal mode of operation to charge
the batteries, denominated Grid-to-Vehicle (G2V), in this paper
is also discussed the possibility of operation as Vehicle-to-Grid
(V2G), in which the batteries of the Electric Vehicle return part
of the stored energy back to the electrical grid. The operation of
the batteries charging systems for EVs is shown through
simulations and experimental results.